不赚不赔；收支平衡
break in
闯入；强行进入
The burglar broke in and stole my money.
夜窃贼破门而入，偷了我的钱。
打断；插嘴
It‘s her usual habit to break in with some ideas of her own.
他常常打断别人的话来发表自己的观点。
Don‘t break in when the adventurer is telling his own story.
冒险家讲他自己的经历时，别打断他。
Children shouldn‘t break in on adults‘ conversation.
小孩子不要打断大人们的谈话。
The telephone ring broke in on/upon my thoughts.
电话铃声打断了我的思路。
训练；驯养；使（某人）熟悉工作
The engineering doctor from abroad only broke in with us last month.
从国外回来的工程博士是上个月才开始和我们一道工作的。
break into
闯入
The thieves broke into the office and stole some money.
小偷闯入办公室，偷了一些钱。
The bandits broke into the jewelry and stole near all the valuable necklaces.
土匪们闯进了珠宝店盗走了几乎所有值钱的项链。
打断；插话
突然…起来
to break into song
突然唱起歌来
The crowd broke into cheers and the drunk bowed.
观众们爆发出一阵欢呼，醉汉鞠了一躬。
The car windows broke into pieces when the two cars crashed into each other.
两辆车相撞时车上的窗玻璃破裂成碎片。
The new waitress dropped the dish on the floor， and it broke into fragments.
新来的女服务员把菜盘子掉在地上，摔成了碎片。
勉强动用
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